I've been trying to get a good picture on what triple-display configurations are possible on my NUC7i7 and what dongles/converters will work. However, the documentation is inconclusive. Can somebody from Intel clear this up?
According to this page:
The supported configuration is:
|Display||Intel NUC Port||TV/Monitor Port||Max Resolution|
|1||HDMI||HDMI or DVI||4096x2160 at 60 Hz|
|2||DisplayPort via USB Type-C||USB Type C, HDMI, or DisplayPort||4096x2304 at 60 Hz|
|3||DisplayPort via USB Type-C||USB Type C, HDMI, or DisplayPort||4096x2304 at 60 Hz|
The DP output on the NUC7i7, according to the specifications on http://www.intel.com/content/dam/support/us/en/documents/boardsandkits/NUC7i5BN_NUC7i7BN_TechProdSpec.pdf , is a Displayport 1.2 (Page 26: "DisplayPort via USB Type-C connector is compliant with the DisplayPort 1.2 specification.". That provides a maximum bandwidth of 21.6 Gbps.
A single 4096x2304@60Hz display takes up 17Gbps of bandwidth. Driving two monitors at that resolution through a single displayport would require not DP 1.2, but DP 1.3 (max bandwidth 34Gbps). I could not find any DP MST hub out there that would support anything over 21.6Gbps according to the specs. So my question to Intel is: what converter would I need for the above supported configuration to work?
My guess is that the above is impossible through DP 1.2 alternate mode. However, that page does not mention Thunderbolt. With 40Gbps of bandwidth, driving two UHD displays at 60Hz should be possible.
But.. For the NUC6 Intel created a page on Thunderbolt compatibility, and on that page they clearly state that a single display is the maximum: Thunderbolt™ 3/USB Type C Information: "Single 4K (Ultra HD) or 1080p video support " For the NUC7 series, no such compatibility page on Thunderbolt exists.
However, when I look at the list of tested peripherals for the NUC7 series (Tested Peripherals for Intel® NUC Kits NUC7i[x]BN ), the following items are in the list:
|Thunderbolt™/USB Type-C Devices (Thunderbolt only supported on i5/i7 models)|
|Plugable||Thunderbolt 3 dual DisplayPort adapter||TBT3-DP2X|
|Plugable||Thunderbolt 3 dual HDMI adapter||TBT3-HDMI2X|
According to the manufacturer, the TBT3-DP2X supports two UHD displays at 60Hz (see Plugable Thunderbolt™ 3 Dual DisplayPort Adapter for Windows | Plugable ). As does the similar Startech TB32DP2 dongle. However, I can't get it to drive two displays (QHD + FHD, theoretically using just 12.75Gbps of bandwidth, but I can only drive one at a time).
I have now bought over EUR 200 of converters on top of the NUC7i7 just to get my triple-display configuration working and I'm still not there, having to revert to an old Displaylink USB -> DVI device and using just a single display on the USB-C/DP/TB port (with a flicker problem, but there is another topic on that).